Aberthaw tests of concrete in sea water . umina; two This \if\\ shiiws nine o! thf piers at almost low tide. Ttie original method of support, by means ^^ ^ *^& CClllvrllL. ol the loops in the reinforcing rods, will lie noted. As these were weakened b,v rust, rings were grouted into the cored holes in 1912, as shown in the individual views on pages 9 to 31 Thp othpi fivP samples consisted of one part cement, three of sand and six of stone, and weremixed quite wet. Number 20 was especially well mixed—much more timebeing taken than is usual in mixing. Number 21 was lost in handling in
Aberthaw tests of concrete in sea water . umina; two This \if\\ shiiws nine o! thf piers at almost low tide. Ttie original method of support, by means ^^ ^ *^& CClllvrllL. ol the loops in the reinforcing rods, will lie noted. As these were weakened b,v rust, rings were grouted into the cored holes in 1912, as shown in the individual views on pages 9 to 31 Thp othpi fivP samples consisted of one part cement, three of sand and six of stone, and weremixed quite wet. Number 20 was especially well mixed—much more timebeing taken than is usual in mixing. Number 21 was lost in handling in 1912,while Number 19 disappeared sometime between 1916 and 1920. Number 22 had one-tenth part by weight of hydrated lime substituted for an equiva-lent amount of the cement, thus making the mixture really hydratedlime; standard Portland cement; three parts sand; six, stone. Number 23 was mixed with a Sylvester solution of soap and alum; Number 24 con-tained finely pulverized clay to the amount of 5 per cent of the weight of. ACTION O F SEA WATER O N CONCRETE the cement. As for brands of cement, the first nine specimens, which weremade from the average standard Portland cement, were formed by mixingtogether eqnal parts of Vulcanite, Alpha and Giant brands. These werethoroughly mixed in the mortar box and then repacked by weight. Thecement of the other specimens was as follows: The cement free from ironwas Blanc Stainless; the commercial Portland high in alunnna was Atlas;the commercial Portland cement low in alumina was a mixture of equalparts Lehigh andHelderberg; theiron ore cementpractically freefrom alumina wasHermmoor ErzGerman Portlandcement; and thecement made fromslag was stone usedwas broken traprock from ciuarries , . , . , , , ,, , , General view of the operations in preparing the piers, showing in loreground the method ul, -u r 1 1 -« •- weighing water and measuring sand at Maiden, Mass., a cubic foot weighing pounds, while the voids
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectconcret, bookyear1920
